Effects of 6-OHDA on OX42 expression in the SNpc. (a) the graph depicts the mean optical density data of 5 to 6 samples in each case. * (Wt saline versus Wt 6-OHDA) and ** (Wt 6-OHDA versus Wt apocynin 6-OHDA). (b) representative digital images of OX42-like immunoreactivity in the saline-injected Wt, 6-OHDA-injected Wt, saline-injected , 6-OHDA-injected , apocynin-treated Wt injected with saline, and apocynin-treated Wt injected with 6-OHDA mice.